The following topics discussed include:
The Passport 4400 supports the use of ISDN, T1 CSU, E1 CSU, or 56k CSU as alternatives
to a frame relay over a WAN link. ISDN services for the Passport 4400 are physically
supported by either an ISDN S/T or ISDN U hardware interface module. T1, E1,
and 56k CSU links are physically supported by the T1 CSU/DSU, E1 CSU/DSU, and
56k CSU/DSU hardware interface modules. For more information about ISDN or CSU/DSU
hardware, refer to 
Reference for the Passport 4400 Cables, 205678-A or
Reference for the Passport
4460 Hardware, 205677-A.
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